JPH02275463A - Production of electrophotographic sensitive material - Google Patents

Abstract

PURPOSE:To prevent the disturbance in end parts, such as coating ends or the build-up in the coating ends by having shielding members for a coating compd. at both ends of a cylindrical base and allowing the coating compd. discharged from a very small aperture to fly like lines with substantially no atomization. CONSTITUTION:The shielding members 101 are provided at both ends of the cylindrical base 102 and the coating compd. discharged from the very small aperture of a nozzle tip 104 provided at the front end of a discharging gun 103 is stuck as the spiral coating compd. 105 onto the cylindrical base 102 to form a uniformly coated film surface 106. The coating compd. does not stick to the lower part of the shielding members 101 if the coating compd. 201 exists on the cylindrical base 102. On the other hand, the coating compd. sticks onto the cylindrical base 102 when the coating compd. 201 discharged while moving in an arrow direction passes the shielding members 101. The generation of the coating ends or the build-up in the coating end parts is obviated at both ends of the cylindrical base 102.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing an electrophotographic photoreceptor in which a coating material is controlled and discharged from a minute opening to form a film.

[Conventional technology]

Conventionally, as a method for manufacturing an electrophotographic photoreceptor by forming a coating film on a support using a paint for forming an electrophotographic photoreceptor, for example, the support is immersed in the paint and gradually pulled up. Known methods include the dip coating method, which uses the surface tension of the paint to form a paint film, and the roll coating method, which forms a paint layer once on a roll and then transfers the paint layer onto a support. It is being

Although the dip coating method can relatively easily form a coating film with a uniform thickness, it requires a large amount of paint and the size of the equipment increases depending on the shape and size of the object to be coated. Furthermore, since all the immersed parts are coated, a coating film is formed even on parts of the object to be coated which do not require a coating film, making it necessary to remove the coating film and reducing work efficiency. Furthermore, there is a possibility that the base layer will be dissolved during multilayer coating, and the resulting mixture in the coating film will cause property deterioration, and the combinations of the base layer and top coat will be limited.

In addition, in the roll coating method, the state of the coating film formed depends on the distance between the roll and the object to be coated, and it is used for coating sheet objects and cylindrical supports where this distance can be easily controlled, but it still requires a large amount of paint. Particularly when applied to a cylindrical support, seams occur in the coating film.

On the other hand, in addition to the above-mentioned coating method, a coating method called a spray method is also known.

The spray method is a method in which paint is ejected from a nozzle with a minute opening and atomized, resulting in minute droplets that adhere to the object to be coated to form a coating film. Furthermore, it is possible to form a coating film over a wide range of photoreceptor substrates, etc., and seamless coating can be applied to cylindrical substrates, etc., making it a very effective method for producing electrophotographic photoreceptors.

However, with this spray method, the pressure during atomization causes the paint to fly off, and the volatile components in the paint tend to evaporate significantly, resulting in a change in the paint composition.Also, the high pressure causes bubbles to form. There are problems such as the coating film tends to get mixed up, making it difficult to obtain a uniform coating film. Furthermore, because the paint is atomized by pressure and becomes radial, it has low adhesion efficiency to the object being coated (and requires exhaust to remove lost paint and paint recovery equipment to prevent contamination). .

Additionally, if a paint film is formed on the object while moving the spray gun relative to the object, some of the scattered atomized paint may adhere to the area where the coating has already been formed, causing the spray gun to move relative to the object. Paint film defects will occur on the top.

Furthermore, since the paint wraps around to areas where the paint film is not formed, there are problems such as the need for protective means to prevent peeling or paint adhesion.

In addition, as seen in Japanese Patent Application Laid-Open No. 52-119651, a liquid injection coating machine or a curtain coating machine is placed close to the surface of the object to be coated, and the viscosity and surface tension of the paint are used to coat the object. A method has been proposed in which the paint is supported between a liquid injection coater or a curtain coater to form a film while preventing paint leakage.

However, since the state of the coating film in this coating method depends on the support state of the paint, it is necessary to precisely control the distance between the object to be coated and the liquid injection coating machine or curtain coating machine, and especially in curtain coating. Ove-like seam unevenness due to the injection part causes streaks in the image. To achieve excellent coating film accuracy and surface condition, it is necessary to check the accuracy of the object to be coated and the accuracy of the injection coating machine or curtain coating machine. This requires extremely high precision, which significantly increases costs.Also, paint tends to leak from the gap between the object to be coated and the coating machine, and it is extremely difficult to maintain stable film-forming conditions.

[Problem that the invention seeks to solve]

As a result of detailed analysis of the process of forming a paint film in the above-mentioned conventional technology, we believe that a uniform paint film is one in which a uniform amount of homogeneous paint is distributed in subdivided parts, and that they are continuous. Paint is gradually applied to the coated surface of the support by discharging a small amount of paint in a streak-like manner without substantially atomizing it from the minute opening of the nozzle tip of the paint dispensing gun onto the support that rotates at a predetermined speed. The applicant had previously proposed a method of coating the entire support to make it resistant to adhesion (Japanese Patent Application No. 62-2608).
No. 57).

In the coating method previously proposed by the applicant, when paint is discharged in streaks onto a rotating cylindrical support from a paint dispensing gun that moves at a constant speed parallel to the rotation axis of the rotating cylindrical support, At the coating start point and the coating start point, coating edges of the paint are formed as shown in FIG. 7(a). In order to avoid forming such a coating edge and to form an edge (Fig. 7(b)) that is perpendicular to the axis of rotation as produced by the conventional dip coating method, it is necessary to It is necessary to temporarily stop the movement of the discharge gun, apply one rotation, move the discharge gun again, and at the end of coating, stop the movement of the discharge gun, continue applying one rotation, and then stop discharging the paint. Met.

However, it is difficult to perform coating for exactly one rotation at the stop position of the discharge gun by such an operation due to the rotation accuracy of the cylindrical support, the tolerance of the outer diameter, the accuracy of the stop time of the discharge gun, etc. When the paint is spread for more than one rotation, for example, 1.1 to 1.5 rotations, the excess paint may overlap the already applied paint portion, resulting in a bulge at the coated end. This was particularly noticeable when the paint was discharged from a plurality of minute openings.

When a photoreceptor in which such a coating end or a bulge at the coating end is formed at the end of a cylindrical support is applied to an electrophotographic device, the spacer rollers provided on the sleeve or developing device, etc. There was a problem that an accurate gap could not be maintained because it would stick to the coated end of the support.

An object of the present invention is to provide a method for manufacturing an electrophotographic photoreceptor with less edge disturbance such as a coating edge or a swell at the coating edge.

Another object of the present invention is to provide a method for manufacturing an electrophotographic photoreceptor in which the movement mode of a discharge gun is simplified.

[Means for solving problems]

That is, the present invention provides a method for manufacturing an electrophotographic photoreceptor in which a paint for forming an electrophotographic photoreceptor is discharged from a minute opening and applied to a surface to be coated on a cylindrical support. This method of manufacturing an electrophotographic photoreceptor includes a paint shielding member and is characterized in that the paint discharged from a minute opening is not substantially atomized and flies continuously in a streaky manner.

As shown in FIG. 1(a), a shielding member 1 according to the present invention
01 are provided at both ends of the cylindrical support 102.

As a result, the paint discharged from the minute opening of the nozzle tip 104 provided at the tip of the discharge gun 103 adheres to the cylindrical support 102 as a spiral paint 105 and is leveled to form a uniform coating surface 106. . As shown in FIG. 2, if the paint 201 being discharged is directly above the shielding member 101, no paint will adhere to the lower part thereof. - On the other hand, when the paint 201 being discharged while moving in the direction of the arrow passes through the shielding member 101, the paint adheres to the cylindrical support 102. As a result, coating end surfaces perpendicular to the long sleeve direction of the cylindrical support can be formed at both ends of the cylindrical support without forming a coating end or a bulge at the coating end.

The distance 202 between the shielding member and the cylindrical support is generally 0.3 mm to 10 mm, preferably 0.4 mm to 5 mm.
mm, particularly preferably in the range of 0.5 mm to 2 mm.

If the distance between the shielding member and the cylindrical support exceeds 10 mm, the paint streaks will collide with each other from the end of the shielding member one after another, and the paint that has accumulated at the end of the shielding member will be repelled by the next colliding paint beam, causing the shielding to fail. Paint spatter may adhere to the surface of the cylindrical support on the back side of the component. The more easily the paint adheres to the surface of the shielding member, the more likely the paint will accumulate, and the more likely the above phenomenon will occur. On the other hand, if the material of the shielding member is one that does not allow paint to adhere to it, the conditions will be much better.Also, if the distance between the shielding member and the cylindrical support is closer, even if paint splashes occur, the conditions will be much better. Although it is possible to reduce the adhesion onto the cylindrical support, if the thickness is smaller than 0.3 mm, the shielding member and the cylindrical support may come into contact with each other.

The cause of paint splashes on the cylindrical support mentioned above is mainly due to paint buildup on the shielding member, especially at its tip, and then the next streak of the paint beam collides on top of it, causing splashes. It's about letting people know.

Therefore, if the structure is such that the paint does not stay at the same location on the shielding member forever and does not flow toward the tip, adhesion of flying paint is less likely to occur, and excess paint can be further removed.

The structure of such a shielding member is as follows: 1. It should have a radius of curvature similar to that of the cylindrical support so that the adhered paint can be quickly lost along the curved surface.

2. A vertical groove is provided in the vertical direction of the shielding member (rotation direction of the cylindrical support) so that the adhered paint flows down to the bottom.

Examples include.

Furthermore, the shape of the tip of the shielding member may be, for example, a third shape.
Examples include those shown in the figure.

Among these, as shown in (d), the front end portion 3 of the shielding member
Q1 has an acute angle structure, and the tip rear part 302 has an obtuse angle structure, and the direction 3 of the paint discharge feature 303 and the tip wall surface 304 is
05 is preferably an acute angle.

With such a shape, the discharged paint that collides with the front part of the tip is immediately released without being subjected to wall resistance, so that the paint does not spill in the direction 307 of the tip of the shielding member, and the paint is spread around the tip 308 of the paint and on the outside 309 of the paint. The flow velocity hardly changes.Therefore, there is almost no chance of the paint going around to the back side of the shielding member and scattering.

Furthermore, in (e), which is an improved version of (d), the tip is divided into two stages, and the rear section 310 cuts off slight scattering caused by collision with the rear tip section 301.

When the tip rear part 301 of the shielding member is at a right angle (
3(a), (b)), the paint flowing near the tip of the shielding member receives resistance from the tip wall surface 303, which has a surface parallel to the paint discharge direction 302, and due to the resultant force with the force in the flow direction of the paint. , the paint swells and flows in the tip direction 304. At this time, the speed of the paint passing near the tip is slow.

Then, after passing through the shielding member, the resistance from the tip wall surface is released, and the paint flows in a direction that goes around the back side of the shielding member to some extent.

In addition, when the tip of the shielding member is semi-round bar-shaped (Fig. 3 (C)
), the direction of the resistance received from it gradually changes. The resultant force of this and the direction of the paint discharge flow is different from the case where the rear end portion 31 is at a right angle, and the resultant force changes direction gently and wraps around to the back side of the shielding member to some extent.

In the method of the present invention for forming a coating film by discharging paint from a minute opening, a state in which the paint is not substantially atomized is a state in which the paint is continuously sprayed in a streak-like manner with a discharge angle of 3° or less, preferably 0°. This shows that.

Considering the concentration in a minute area (the paint spreads slightly on the board, it concentrates in about 1/100 of the area), the discharge speed is 3.
0 m/sec or less is preferable, more preferably 25 m/s
ec to 2 m/sec, especially 10 m/sec
A range of sec to 5 m/sea is preferred.

The distance between the object to be coated and the minute opening is preferably in the range of 2 to 100 mm, particularly 5 to 50 mm. Paints can be applied to a wide range of applications, including those with solid content dissolved or dispersed in a solvent, and those with only solid content.In addition, not only volatile solvents but also non-volatile solvents can be used. The viscosity of the paint is 1000c because the paint is smoothed by surface tension after it adheres to the substrate.
ps, even 200cps or less, especially 50Cps~
A range of 4 cps is preferable.

Further, the discharge port diameter of the minute opening is preferably 200 μm or less, more preferably in the range of 50 μm to 180 μm, particularly preferably in the range of 60 μm to 150 μm. The discharge pressure of the paint from the minute opening is preferably 3Kgf/crrd or less, more preferably 0.3Kgf/crrr to 1.5
Kgf/crrr range, especially.

is preferably in the range of 0.5 Kgf/cnf to IKgf/crrr. The amount of paint discharged is preferably 20 cc/min or less, particularly in the range of 0.8 cc/min to 15 cc/min.

Paints for forming electrophotographic photoreceptors include paints for forming photosensitive layers such as paints for forming charge generation layers and paints for forming charge transport layers;
Other examples include paints for forming an undercoat layer to improve adhesion and barrier properties, and paints for forming intermediate layers such as paints for forming a conductive layer to prevent local batteries in metal seals and hide defects. It will be done.

As the paint for forming the charge generation layer, charge generation substances such as azo pigments, quinone pigments, quinocyanine pigments, perylene pigments, indigo pigments, and phthalocyanine pigments may be used. Examples include dispersions in which a binder resin is further dispersed in an organic solvent such as alcohol, ketone, ether, aliphatic halogenated hydrocarbon, or aromatic solvent.

The paint for forming the charge transport layer includes charge transport substances such as styryl compounds, hydrazone compounds, carbazole compounds, pyrazoline compounds, benzidine compounds, and triarylmethane compounds, as well as polyarylates, polystyrene, acrylic resins, and polyesters. Examples include a solution in which a binder resin such as polycarbonate is dissolved in an organic solvent as described above.

Examples of the paint for forming the undercoat layer include solutions in which resins such as casein, polyvinyl alcohol, and polyamide are dissolved in the organic solvents mentioned above.

The paint for forming the conductive layer includes a dispersion of conductive particles such as titanium oxide, tin oxide, and carbon black dispersed in a suitable resin such as epoxy resin, phenol resin, and polyurethane, and an organic solvent as described above. can be mentioned.

Note that additives such as lubricants, antioxidants, and leveling agents may be added to each of these paints.

Examples of the cylindrical support include an aluminum cylinder, an aluminum alloy cylinder, and a stainless steel cylinder.

As for the layer structure of the electrophotographic photoreceptor, an intermediate layer and a photosensitive layer are sequentially laminated on a support.
A conductive layer and an undercoat layer are laminated, and the photosensitive layer is
A charge generation layer and a charge transport layer are laminated.

The preferred thickness of each layer is 5 to 30 μm for the conductive layer, 0.1 to 5 μm for the undercoat layer, and 0.01 to 3 μm for the charge generation layer.
One charge transport layer has a thickness of 10 to 30 μm.

The coating method of the present invention is preferably applied to form all of the conductive layer, undercoat layer, charge generation layer and charge transport layer, but only one or two of these layers may be applied.
Some of the layers may also be formed by other coating methods, such as dip coating methods. Further, as the layer structure of the electrophotographic photoreceptor, it is not necessary to form a conductive layer and/or an undercoat layer. Furthermore, in the structure of the photosensitive layer, the charge generation layer may be formed on the charge transport layer, and the photosensitive layer may be of a single layer type instead of a laminated type.

FIG. 4 shows a specific example of a coating apparatus for forming a coating film on the surface of a cylindrical cylinder such as an electrophotographic photoreceptor using the coating method according to the present invention.

In FIG. 4, the cylindrical support 102 is fixed to a rotating shaft 401 which also serves as a support. Further, the rotating shaft 401 is rotated by a rotating motor 402 at a predetermined rotational speed. On the other hand, a gun 103 for discharging a beam-shaped coating liquid
is placed on a pedestal 403 of the lateral feed mechanism, and moves in a direction parallel to the rotation axis direction of the cylindrical support 102. Further, the gun 103 includes a filter 404 and an outlet pipe 405.
It is connected to tank 406 via. The compressed air introduced by the air vibrator 407 causes the gauge 408 to
The paint in the tank 406 is pressurized to the pressure determined by , and is sent to the gun 103 via the filter 404 and the outlet pipe
It is discharged from a nozzle tip (not shown) at the tip of the.

When actually applying coating using this device, the switch for the transverse feed mechanism of the gun and the air switch of the gun needle are set, and a beam-shaped coating liquid is discharged from a predetermined position on the cylindrical support 102. At the same time, the rotation motor is also turned on to rotate the rotation shaft holding the cylindrical support. The beam-shaped coating liquid discharged from the nozzle tip provided at the tip of the gun adheres to the cylindrical support in a threaded pattern (spiral shape), and the coating film is formed by leveling. A film is formed. The process of forming a coating film by leveling is as shown below. In other words, the spool-shaped paint deposited on the cylindrical support gradually spreads over a wider area as shown in Figure 5(a) due to the collision energy of the paint, the surface tension of the paint, and the surface tension of the object being coated. Then, adjacent paints come into contact with each other and cover the surface of the object to be coated without gaps. After an appropriate amount of time has passed depending on the surface tension and diffusivity of the paint and the surface tension of the object being coated,
The initial unevenness of the coating film depending on the pitch is smoothed out by leveling, and a smooth surface is formed as shown in FIG. 5(b). It should be noted that the paint applied in a spool shape may be applied such that the ends of the paint overlap or do not overlap. Furthermore, if a hood is also used to control the solvent vapor of the paint, it is possible to make the surface smoother.

The pitch of the line of spools formed by the beam is determined by the rotation speed and gun feed rate.

Further, the amount of coating liquid per unit area is determined by the feed speed if the discharge amount is constant.

P-r ΔV・“o, d Δv, 2 billion unit area equivalent amount (CC7 min・crrf) P
: Discharge pressure (Kgf/c) r : Discharge opening diameter (am) d Niorifice bearing length (cm) υ : Feed speed (cm/min) Regarding the pitch width of the beam, the following relationship exists.

Pw (X kneep,: Beam pitch (cm) Ro Niji cylinder rotation speed (rpm) Figure 6 shows a specific example of a paint discharge port. Figure 6 (a) shows a standard single discharge port. Although the nozzle chip 104 is shown having a plurality of ejection ports, in order to increase the coating speed, the nozzle chip 104' may have a plurality of ejection ports, such as a nozzle chip 104' having three ejection ports.

It is also possible to use a cylindrical body with a bottom cover formed therein, which is simply made with a hole in the bottom cover.

The present invention will be further explained below with reference to Examples. Note that all parts are by weight.

Example-1 As a paint for the conductive layer, 10 parts of phenolic resin (manufactured by Dainippon Ink Co., Ltd., trade name Nibryophen J-325), 11 parts of titanium oxide whose surface was treated with tin oxide and antimony oxide, and oxide whose surface was treated with alumina were used. fmm for dispersion in 11 parts of titanium, 4 parts of methanol, and 9 parts of methylcellosolve.
Hard glass beads of φ were placed in the same volume as the material and dispersed for 2 hours using a sand mill disperser. The dispersed paint is diluted to a solid content of 35% with a mixed solvent of 1:1 methanol and methylcellosolve. At this time, the viscosity of the paint is 15 cps.
Met.

Put this paint into a conductive layer coating tank, attach a nozzle tip with a diameter of 70 μm to the tip of a beam gun using the coating device shown in Figure 4, and apply IK g f / crd to the tank.
The amount of paint discharged from the gun was measured by applying an air pressure of 12 cc per minute, and the discharge speed was 9 m/sec. The shape of the shielding member was a curved surface that followed the shape of the cylinder, and the shape of the tip was as shown in FIG. 3(e). Further, the distance between the shielding member and the cylinder was 1 mm.

Next, the distance between the gun and the object to be coated was adjusted to 20 mm, and an aluminum cylinder with a diameter of 80 mmφ and a length of 360 mm was rotated at 1,100 rpm and the gun was fed at a speed of 420 mm/min to form streaks without atomizing the paint. A conductive layer was applied. The paint adheres to the cylinder in the form of threads with a pitch width of approximately 2 mm, and then the lines of overlapping paint that are applied mix and leveling begins, and after 5 minutes, a smooth surface with a surface roughness of 0.2 μm or less is formed. The beam pitch unevenness is gone. After the coating film was forcibly evacuated to evaporate the solvent, it was heated to 140°C.
It was cured for 30 minutes in a drying oven. The thickness of the conductive layer at this time was 20 μm.

After cooling the aluminum cylinder coated with the conductive layer and returning it to room temperature, 1 part of polyamide resin (manufactured by Toshi Co., Ltd., trade name: Amilan CM-8000) and a methoxymethyl-modified 6-nylon polyamide resin ( A paint requiring undercoating was prepared by dissolving 3 parts of Niresin EF-30T (trade name, manufactured by Teikoku Kagaku Co., Ltd.) in 130 parts of methanol and 66 parts of 1-butanol. The paint viscosity was 10 cps.

Pour this paint into a paint tank for underpainting, attach a 100 μm diameter nozzle tip to the tip of the gun, and add 0.0 μm to the tank.
When applying a pressure of 6 kgf/crrr and measuring the amount of paint discharged from the gun, it was 8 cc per minute, and the discharge speed was 8 m/s.
It was ea. The distance between this gun and the object to be coated is 20mm.
The conductive layer was applied to the cylinder at a rotational speed of 12 rpm and a gun feed rate of 660 mm/min to apply the undercoat layer. The width of the beam of the undercoat layer deposited on the conductive layer is approximately 2 mm, and the paint adheres in the form of threads, and leveling begins when the overlapping paint lines are mixed and the surface becomes rough after 5 minutes. The surface was smooth with a diameter of 0.1 μm, and the pitch unevenness of the beam was eliminated. After the coating film was forcibly evacuated to evaporate the solvent, it was dried in a drying oven at 90°C for 10 minutes. The thickness of the undercoat layer is 0.
．． It was 5 μm.

The aluminum cylinder coated with the undercoat layer is cooled to room temperature. Next, 10 parts of poly(vinyl acetate-corvinyl alcohol-corvinylbenzal) was dissolved in 90 parts of cyclohexanone, and disazo pigment (2-[-4'(3-(2-chlorophenyl) 25 parts of carbamoyl-2-hydroxy-1-naphthylazo)benzoxazole) were added as a solid content, and an additional 300 parts of
1 part of cyclohexanone and 250 parts of tetrahydrofuran were added, and the mixture was dispersed in a sand mill at 900 rpm for 40 hours with an equal volume of 1 mm diameter hard glass beads to separate the beads, and then cyclohexane was added to reduce the solid content to 0.5%. Adjusted to. Put this paint in a charge generation layer coating tank, attach a nozzle tip with a diameter of 75-μm to the tip of a beam gun, and add 0.5Kgf/crd to the tank.
The amount of paint discharged from the gun was measured by applying a pressure of 2.5 cc per minute, and the discharge speed was 9 m/sec.

Next, the distance between this gun and the object to be coated was adjusted to 10 mm, and the conductive layer and undercoat layer were applied.
Rotate the beam gun at 240mm per minute while rotating at rpm.
The charge generation layer was applied in streaks without atomizing the paint by moving it in the direction of the generatrix of the cylinder. The width of the beam of the charge generation layer deposited on the undercoat layer is approximately 1.5 mm, and the paint adheres in the form of threads.The overlapping paint lines are then mixed and leveling begins, and after 5 minutes. The coating film was made uniform, resulting in a surface with no density unevenness, and the pitch unevenness of the beam was eliminated.

After the coating film was forcibly evacuated to evaporate the solvent, it was dried in a drying oven at 90° C. for 5 minutes. The thickness of the charge generation layer at this time was 0.15 μm.

The aluminum cylinder coated with the charge generation layer is cooled to room temperature. Next, 10 parts of polycarbonate resin (Mitsubishi Gas Chemical type, trade name: Z-200) and a hydrazone compound (
p-(N,N-diethylamino)benzaldehyde-N
'-α-naphthyl-N'-phenylhydrazone)9.
5 parts are dissolved in 100 parts of monochlorobenzene and 40 parts of dichloromethane. The viscosity of the paint was 15 cps.

This paint was placed in a coating tank for the charge transport layer, a nozzle tip with a diameter of 150 μm was attached to the tip of a beam gun, and an air pressure of 0.6 kgf/cn was applied to the tank, and the paint discharge rate from the gun was measured to be 28 cc/min. The discharge speed was 9 m/sec.

Next, adjust the distance between this gun and the object to be coated to 20 mm, apply the coating to the charge generation layer, and then attach the aluminum cylinder to 12 mm.
Beam gun at 560mm per minute while rotating at 0rpm
was moved in the direction of the generatrix of the cylinder, and the charge generation layer was applied in streaks without atomizing the paint.

The beam width of the charge transport layer deposited on the charge generation layer is approximately 2
The paint adheres in the form of threads at a depth of 1.5 mm, and then the overlapping paint lines are mixed and leveling begins. After 5 minutes, the surface becomes smooth with a surface roughness of 0.2 μm or less, and the beam pitch unevenness disappears. Ta. After the coating film was forcibly evacuated to evaporate the solvent, it was placed in a drying oven at 120℃ for 60 minutes
Let dry for a minute. The thickness of the coating film at this time was 20 μm.

Example 2 An electrophotographic photoreceptor was manufactured in the same manner as in Example 1 except that the tip shape of the shielding member was changed to that shown in FIG. 3(d).

Example 3 An electrophotographic photoreceptor was manufactured in the same manner as in Example 1 except that the tip end shape of the shielding member was changed to that shown in FIG. 3(a).

Example 4 An electrophotographic photoreceptor was manufactured in the same manner as Example 3 except that the distance between the shielding member and the cylinder was 4 mm.

Example 5 An electrophotographic photoreceptor was manufactured in the same manner as in Example 3 except that the shielding member had a planar shape.

Comparative example-1 Example 1 except that no shielding member is provided An electrophotographic photoreceptor was manufactured.

The above results are shown in Table 1.

Figure 2 is a diagram schematically showing the movement state of the discharged paint, and Figure 3 is a conceptual diagram schematically showing the shape of the tip of the shielding member and the flow of paint. , Fig. 4 is a schematic diagram of the coating device, Fig. 5 is a schematic diagram of the state of adhered paint, Fig. 6 is a specific example of the paint discharge port, and Fig. 7 is a schematic diagram of the end of the cylindrical support. It is.

〔Effect of the invention〕

As described above, according to the method for manufacturing an electrophotographic photoreceptor of the present invention, an electrophotographic photoreceptor without edge disturbance can be obtained.

[Brief explanation of drawings]

Claims (1)

[Claims] (1) In a method for manufacturing an electrophotographic photoreceptor in which a paint for forming an electrophotographic photoreceptor is discharged from a minute opening and applied to a surface to be coated on a cylindrical support, a paint shielding member is provided at both ends of the cylindrical support. 1. A method for producing an electrophotographic photoreceptor, characterized in that the paint discharged from a minute opening is not substantially atomized and flies continuously in a streaky manner.